摘要
A water-triggered green synthesis strategy is developed for CsPbBr 3 nanocrystals. • Multidentate ligand anchoring induces Pb–O dominated surface coordination. • Surface coordination reconstruction effectively passivates undercoordinated Pb sites and suppresses defect states. • The resulting nanocrystals exhibit enhanced stability under aqueous and irradiation conditions. Surface instability originating from highly reactive undercoordinated Pb sites poses a critical bottleneck for the practical deployment of CsPbBr 3 nanocrystals (NCs), especially under aqueous exposure and high-dose irradiation environments. Herein, we demonstrate a facile water-triggered strategy to fabricate ultra-stable CsPbBr 3 NCs, which relies on the Cs 4 PbBr 6 precursor transformation mediated by multidentate ligand synergistic anchoring. Specifically, the cooperative coordination of 4,4′-azobis (4-cyanovaleric acid) and oleylamine regulates the dynamic equilibrium between CsBr detachment and water-induced interfacial interaction, thereby realizing the in-situ construction of a Pb–O-dominated surface passivation layer on CsPbBr 3 NCs. Such a reconstructed surface configuration efficiently passivates undercoordinated Pb defect sites, inhibits defect generation, and reinforces the structural robustness of the perovskite lattice. Impressively, the as-obtained CsPbBr 3 NCs exhibit remarkable harsh-environment tolerance: they preserve 91.53% of the initial radioluminescence intensity after 2080 Gy γ-ray irradiation, and even display a boosted emission intensity during long-term aqueous storage. These results elucidate the critical function of water-mediated surface coordination chemistry in tailoring defect states of perovskite NCs, and offer a universal and feasible route to enhance the stability of CsPbBr 3 NCs under harsh conditions. Download: Download high-res image (166KB) Download: Download full-size image
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